How to loop max 5 post custom values?

Hi, im using code, which loops me all post custom values:

<?php
$mykey_values = get_post_custom_values('wpcf-in-recipe');
foreach ( $mykey_values as $key => $value ) {
echo "<li><span>$value</span></li>";
}
?>

I need that code to loop max 5 custom values items

Maybe anybody know the solution?

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